Asked by Anna

a cellular phone company offers a contract for which the cost C, in dollars of t minutes of telephoning is given c=0.25(t-300)+65.95 where it is assumed that t >== 300 minutes what times will keep costs between 106.20 and 139.20?


I am already lost at word problems... please help this is my last math problem.... I promise...
Answered by Anna
would it be 500 minutes??
Answered by bobpursley
No, you need two times, it asks for what times.

for 106.20 dollar
106.2=.25(t-300)+65.95
.25t=106.2-65.95+75
t=461 min. check that.
You do the other
Answered by Anna
Ok I got it it has to be betwee 461 and 593 minutes
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